Slip-Ons Represent The First Step In The Exhaust System Tuning Process, And They Offer A Great Balance Between Price And Performance. Change The Nature Of Your Bike By Adding More Power, Improved Performance, And The Unique Akrapovic Sound. Everything Packed In Stylishly Designed Slip-On Exhaust Systems. The Result Of Taking Design Very Seriously Is A Beautifully Crafted Exhaust System.The Muffler Outer Sleeve Is Made Of Titanium, While The End Cap Is Made Of Carbon Fibre. Race-Proven Materials. Exhaust System Is Compatible With BMW Side Cases.